Reciprocating bed for printing-machines.



- w. c. SCOTT. RECIPROCATINQIBEID Fon rnmrmemcnmss.

Patented Mar. 12, 1918.

m/mvrol? Walk/ C. 300%.

, N 1 g z l A TTOR/VEV WI T NE 885 6 UNITED s'ra'rss PATENT OFFICE.

WALTER CHARLES SCOTT, OF PLAINFIELD, NEW JERSEY, ASSIGNOR TO ISABELLA SCOTT AND DAVID J; SCOTT, EXECUTORS F WALTER SCOTT," DECEASED, LATE OF PLAIN- FIELD. NEW JERSEY.

RECIPROCATING BED FOR PRINTING-MACHINES.

Specification of Letters Patent;

Patented Mar. 12, 1918.

'- Application filed October 19, 1914. Serial No. 867,329.

'1' HM who/11 116 "mycomm/'11 v lie it known thatl. Wat/run bco'rr, a citizen ot the l'nited States, and a resident o't l lainticld. in the countTTot' Union and State of xoe Jcrsc vf have inv'ented, certain new and useful Improvements in Reciprocatinir-lleds for lrinting-Machines; of which the following is a specification.

The present invention relates generally-t0 reciprocating t'orm beds for printing machinesi'and has more particuhirly reference to the materials of which said beds are composed.

-It is well 'known in the art of printing that the speed oi the modern flat bed press .is governed almost entirely by the ease and facility with which the reversing action'ot the bed nlay he aceoinplislnsd; and that the \\eig {ht ol the bed is one of the factors that interferes with its quick and easy reversal. 1

As is well known Ill the art, the term from WhHll the printing IS done, and

which is carried on the; type bed, has gen erally a slightly uneven surface. and this is true whether it is entirely made up of type, or wholly of illustrations. or of both. Conshlerahlc work, therel'i'n'e. known as1na ke ready must. be. done to overcome this ilevenness in the form so that the proper effect may he obtained in the printed product. The usual method of making-ready is to attach to the impression surface at points opposite the defective places :in' the form an'amount of packing sullicient to relieve the. pressure where the Form prints too heavily 01' to increase it where the form prints too lightly To do this without producing in the impression conspicuous lines 40 marking the points at which pressure was increased or decreased. is a matter of considerable skill, especially in ntaking-read illustrations, the, ordinary type, bed of a press is usually so rigid that the printed product will ShOW the effect of any thickness added to the impression surface, even when it is as slight as that of tissue paper. I

In studying the above described disadvantages of present day typeheds. which are generally made of iron or a mixture, of iron, and in endearori'ng to reduce the Weight and to provide a 'lori'n supporting surface that Will be substantial and atthe same time of a perceptibly ductile or malleable characte|.-, so as to aeeommbdate itself in some degree to the inequalities of the torin, tests have been n'iade that establishes 'the-fact that making a type bed of aluminlnn or an alloy thereof represents a great advance in the art, because the substitution for the, heavier metal. of a metallic type bed made of much lighter material admits of the bed being reversed at a higher rate of speed, with less shock and at the same time the metal is peculiarly adapted to equalize to some extent the dillerenees in-the-impress tion is illustrated in several concrete and pre'l'crrtal forlns. From which Ioruts, how ever, changes in construction niav be made. withoutdeparting: 'lrom the legitimate and intended scope ot the invcntirm.

in said drawings;

Figure l, is a longitudinal sectional view of a reciprocatin; ed embodying the invention.

Fig. 2 is a view sinl ar to Fig. 1. show ing a modified Form of the invention.

Fig, 3 is a transversesectional view on the line 11-43 ol Fig. 'l. sflowinga still further modification oli the invention;

Similar characters of refermure indicate, corresponding parts in the several views.

1 indicates the body portion of a reciprocating hed provided with the customary itingitudinal and transvgrse webbing or ri 2 and 3. This bod. ortion is made Ofia 'm mi having the (f lble characteristic of ton and of being per mlleable so that it will realize the difi'erenees in the impress tha .gare caused by inequalities in the form a 1 impression surfaces. I The metal used t n the body portion of the bed is alulninl or an alloy thereof, duced for instance by such as may be, p" copper and alumni omc. or all of the.

being lighter than ccptiblv ductile or have. a tendency tr wearing surfaces of the bed are suitably hardened. For instance, an iron or steel sheathing 4 may cover the top surface on which the type or form rests. This sheathing may be secured to the bed in any suitable manner. In Fig. 1 a stationary clamp 5 and an adjustable clamp 6 are utilized. In Fig. 2 the covering 4 is welded, or electroplated to the bed, or applied thereto by the atomizing blast process. In Fig. 3 the coverin is secured to the bed by screws 7. The thickness of tile covering 4 shod-id be as light as possible so as not to detract from the equalizing function of the aluminum. So also the ribs'or webs 2 and 3, which usually run on roller bearings, may be shod with steel or iron etc. as indicated at 8.

Beds of this type are usually provided with longitudinal bearers at their side edges which engage corresponding bearers on the c linder. In the prescnt'embodiment of t e invention these bearers may likewise be made of steel or iron and may be secured to the bed in any suitable manner.

\Vha't is claimed, 1s:

1. A reciprocating form bed for printing machims composed of a metal which has the double characteristic of being lighter than iron and being perccptibly ductile or malleable and" having its type ,-surfacc harder than the body thereof.

2. A reciprocating form bed for printingmachinescomposed of a metal which has the double characteristic of being llghter than machines composed of a metal which has the double characteristic of being lighter than iron and. ofbeing porceptiblyl duetilee or malleable, longitudinal hearers on the upper side edges of the bed and ribs on the,

under surface of the bed. said bearers andthan , Union and State of New Jersey this 16th day of October A. l). 1914.

\VALTER CHARLES SCOTT. Witnesses:

CARL E. Deacon, J. V. Conn. 

